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# SpriteKit Data Types

Data types used across SpriteKit.

## Topics

### Data Types

[`typealias SKActionTimingFunction`](/documentation/SpriteKit/SKActionTimingFunction)

The signature for the custom timing block.

[`typealias SKFieldForceEvaluator`](/documentation/SpriteKit/SKFieldForceEvaluator)

The definition for a custom block that processes a single physics body’s interaction with the field.

[`typedef float __attribute__((ext_vector_type(3))) vector_float3;`](/documentation/SpriteKit/vector_float3)

A floating point vector type used to perform physics calculations.


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